Malicious PDF — malware analysis report

Static analysis result for SHA-256 91de4fd4d26f5ff3…

MALICIOUS

PDF

45.9 KB Created: 2020-08-08 16:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8da60aa037a2cfa68df08b47a0c492b SHA-1: 7fb2c5362e7017832bc88d8b28f475d77d73c477 SHA-256: 91de4fd4d26f5ff3d9336b0b4e1341a6013f43e61fd02fb584d1e08bd8ec7460
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'data structures and algorithms' and the URL 'https://ttraff.com/pify?keyword=data+structures+and+algorithms+in+python+michael+t.+goodrich+pdf' which is a clear indicator of a lure. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=data+structures+and+algorithms+in+python+michael+t.+goodrich+pdf
    • http://nopef.kirstinsimpson.com/uploads/1/3/1/3/131383483/lavilaxon.pdf
    • http://files.homesweethome.com.sg/uploads/1/3/2/8/132814182/funatigiwaf-zazolisozururun.pdf
    • http://files.militarymovieprops.com/uploads/1/3/1/4/131407958/c35cdb830df77.pdf
    • http://files.melanatedmama.com/uploads/1/3/1/3/131379639/e64623b1b68af0d.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/82200221695.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/74214877347.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/jizokoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8283/files/97699125541.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/84868349271.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/46296737294.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/dibusefado.pdf
    • https://cdn.shopify.com/s/files/1/0436/2888/8227/files/bspp_thread_standard.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/kumagulesaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/76527813088.pdf
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/mexas.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/96292499603.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/spicules_of_sponges.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656b.bin
79c1191108cfee592ec25f72d62210ec23261cea1d45cad821f94b3239501399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 5584 bytes
font_01_sfnt_off00007848.bin
171d678824b9cf6d58b8745a3f09d93efc04e97da76b0bb9bf5df76d55e3a978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7848 10428 bytes
font_02_sfnt_off00009bc2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC2 4324 bytes

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